论文标题
石墨烯 - 金属异质结构中第三次谐波产生的巨型增强
Giant enhancement of third-harmonic generation in graphene-metal heterostructures
论文作者
论文摘要
非线性纳米光子学利用工程的纳米结构将光融入小体积，并通过光谱和空间控制加强非线性光学过程。由于其本质上较大且可调的非线性光学响应，石墨烯是非线性光电应用的特别有希望的纳米材料。在这里，我们报告了石墨烯 - 构造器 - 金属异质结构中异常强的光学非线性，与裸露的石墨烯相比，第三谐波信号的三个数量级增强。此外，通过通过外部门电压增加石墨烯费米能量，我们发现石墨烯等离子元素介导光学非线性并修改第三谐波信号。我们的发现表明，石墨烯 - 绝缘仪金属是光学控制和电气可调的纳米 - 欧环元组件的有前途的异质结构。
Nonlinear nanophotonics leverages engineered nanostructures to funnel light into small volumes and intensify nonlinear optical processes with spectral and spatial control. Due to its intrinsically large and electrically tunable nonlinear optical response, graphene is an especially promising nanomaterial for nonlinear optoelectronic applications. Here we report on exceptionally strong optical nonlinearities in graphene-insulator-metal heterostructures, demonstrating an enhancement by three orders of magnitude in the third-harmonic signal compared to bare graphene. Furthermore, by increasing the graphene Fermi energy through an external gate voltage, we find that graphene plasmons mediate the optical nonlinearity and modify the third-harmonic signal. Our findings show that graphene-insulator-metal is a promising heterostructure for optically-controlled and electrically-tunable nano-optoelectronic components.
